Some 4,000 years ago a young woman's cremated bones – charred scraps of her shroud and the wood from her funeral pyre still clinging to them – was carefully wrapped in a fur along with her most valuable possessions, packed into a basket, and carried up to one of the highest and most exposed spots on Dartmoor, where they were buried in a small stone box covered by a mound of peat.

The discovery of her remains is rewriting the history of the bronze age moor. The bundle contained a treasury of unique objects: a tin bead and 34 tin studs, which are the earliest evidence of metal-working in the south-west; textiles, including a unique nettle fibre belt with a leather fringe; jewellery, including amber from the Baltic and shale from Whitby; and wooden ear studs, which are the earliest examples of wood turning ever found in Britain.

The site chosen for her grave was no accident. At 600 metres above sea level, White Horse hill is so remote that getting there even today is a 45-minute walk across heather and bog, after a half-hour drive up a military track from the nearest road. The closest known prehistoric habitation site is far down in the valley below, near the grave of the former poet laureate Ted Hughes.

Analysing and interpreting one of the most intriguing burials ever found in Britain is now occupying scientists across several continents. A BBC documentary, Mystery of the Moor, was first intended only for local broadcast, but as the scale of the find became clear, it will now be shown nationally on BBC2 on 9 March.

The site of the find on White Horse hill

Scientists in Britain, Denmark and the Smithsonian in the US have been working on the fur. It is not dog, wolf, deer, horse or sheep, but may be a bear skin, from a species that became extinct in Britain at least 1,000 years ago.

"I am consumed with excitement about this find. I never expected to see anything like it in my lifetime," Jane Marchand, chief archaeologist at the Dartmoor National Park Authority said. "The last Dartmoor burial with grave goods was back in the days of the Victorian gentleman antiquarians. This is the first scientifically excavated burial on the moor, and the most significant ever."

It has not yet been possible definitively to identify the sex of the fragmented charred bones, though they suggest a slight individual aged between 15 and 25 years.

"I shouldn't really say her – but given the nature of the objects, and the fact that there is no dagger or other weapon of any kind, such as we know were found in other burials from the period, I personally have no doubt that this was a young woman," Marchand said. "Any one of the artefacts would make the find remarkable."

Although Dartmoor is speckled with prehistoric monuments, including standing stones, stone rows, and hundreds of circular hut sites, very few prehistoric burials of any kind have been found. What gives the White Horse hill international importance is the survival of so much organic material, which usually disintegrates without trace in the acid soil.

A woven bag found at the site

Apart from the basket, this burial had the belt; the ear studs – identical to those on sale in many goth shops – made from spindle wood, a hard fine-grained wood often used for knitting needles, from trees which still grow on the lower slopes of Dartmoor; and the unique arm band, plaited from cowhair and originally studded with 34 tin beads that would have shone like silver. There were even charred scraps of textile that may be the remains of a shroud, and fragments of charcoal from the funeral pyre.

Although tin – essential for making bronze – from Cornwall and Devon became famous across the ancient world, there was no previous evidence of smelting from such an early date. The necklace, which included amber from the Baltic, had a large tin bead made from part of an ingot beaten flat and then rolled. Although research continues, the archaeologists are convinced it was made locally.

The cist, a stone box, was first spotted more than a decade ago by a walker on Duchy of Cornwall land, when an end slab collapsed as the peat mound that had sheltered it for 4,000 years was gradually washed away. However, it was only excavated three years ago when archaeologists realised the site was eroding so fast any possible contents would inevitably soon be lost. It was only when they lifted the top slab that the scale of the discovery became apparent. The fur and the basket were a wet blackened sludgy mess, but through it they could see beads and other objects. "As we carefully lifted the bundle a bead fell out – and I knew immediately we had something extraordinary," Marchand said. "Previously we had eight beads from Dartmoor; now we have 200."

The contents were taken to the Wiltshire conservation laboratory, where the basket alone took a year's work to clean, freeze dry, and have its contents removed. The empty cist was reconstructed on the site. However, this winter's storms have done so much damage the archaeologists are now debating whether they will have to move the stones or leave them to inevitable disintegration.

The jewellery and other conserved artefacts will feature in an exhibition later this year at Plymouth city museum, but although work continues on her bones, it is unlikely to answer the mystery of who she was, how she died, and why at such a young age she merited a burial fit for a queen.